Find index of object in array with highest value in property

I have no idea how many objects there will be in my array but they will all have different values for their properties, I just gave some examples here.

Question

I need to find a way to go through all these objects and retrieve the index of the object that has the highest value in article.number. How can I achieve this? I may only use javascript, jQuery, etc.. no other languages.

I'm guessing this will involve using both $.grep and Math.max but I'm stuck, I've never worked with $.grep before.

There are many ways to do this, Math.max(), $.grep and $.map being a few, but an easy and readable method that should be understandable is to just iterate the object, and check if the value is higher than a variable, if it is, set the variable to the higher number :